EDFAs with high Al concentrations are optimised for wavelength division multiplexed (WDM) transmission systems. Gain excursion is succesfully suppressed to within 0.02 dB/nm/stage for the six-stage common amplification of WDM signals ranging from 1545 to 1557 nm. This result shows the possibility of multistage repeatered WDM transmission without gain equalisation.
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Yoshida et al. (1995) studied this question.
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